Okanagan Autocross

I have 3M clear bra on the front bumper and the cone marks are near impossible to remove.

Without the obvious suggestion of "don't hit cones" , anyone have suggestions to try?

So far, with much elbow grease, I have tried to no avail:
- soap and water
- microfibre cloths
- magic eraser
- clay bar
- swirl remover wax/polish
- WD40
- brake cleaner (somewhat successful, but worried about melting the clear bar and removing paint)

I bought some of this:http://www.mothers.com/02_products/0922 ... slider1=10
so hopefully it works

Most everything I've heard of is a little aggressive.....

- goo gone
- bug and tar remover
- rain-x
- polishing compound
- isopropyl alcohol
- Mr. Clean magic eraser

How about Go-Jo hand cleaner with pumice?

I think the soft 3M gets roughed up by the impact and the black gets into the tiny grooves so it hard to get in deep to clean it.
I would call Mirror Image and ask.
I use Goof Off 2. It's ok on plastic.

I've had excellent results with Maguire's Cleaner Wax, but that's on paint. Not sure about the bra. Also, helpful hint - don't Google "clear bra" while at work